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Homework Help: Find Polar Coordinates

  1. May 5, 2013 #1
    1. The problem statement, all variables and given/known data
    Find polar coordinates.

    2. Relevant equations
    Cartesian: (-3,4)

    3. The attempt at a solution
    r = sqrt(9+16) = 5
    sinθ = 4/5
    cosθ = -3/5

    θ = ∏ - arctan(4/3)

    Answer: (5, ∏ - arctan(4/3))

    I do not understand why we have subtracted the value arctan(4/3) from pi?
  2. jcsd
  3. May 5, 2013 #2
    What is the range of arctan? And where is the point really located?
  4. May 5, 2013 #3
    Because the Cartesian coordinates (-3,4) are in 2th Quadrant
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